R. J. Parker、Leone Spiccia、Stuart R. Batten 等 5 位作者2001-07-26Inorganic Chemistry
Substitution of the weakly binding aqua ligand in [Cu(tren)OH2](2+) and [Cu(tpa)OH2](2+) (tren = tris(2-aminoethyl)amine; tpa = tris(2-pyridylmethyl)amine) by a cyano ligand on ferricyanide results in the assembly of heteropolynuclear cations around the cyanometalate core. In water, the reduction of the Fe(III) core t…
Metal-Organic Frameworks: Synthesis and ApplicationsMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Yossef A. Elabd、James M. Sloan、Nora Beck Tan 等 4 位作者2001-07-26Macromolecules
The diffusion of deuterated hexane in conformational isomers of a heterogeneous polymer, H 12 MDI (4,4‘-dicyclohexylmethane diisocyanate)/BD (1,4-butanediol)/PTMO (poly(tetramethylene oxide)), was investigated at a fixed hard segment content of 30 wt % and compared to the diffusion of acetonitrile. The effective diffu…
Polymer crystallization and propertiesFuel Cells and Related MaterialsMembrane Separation and Gas Transport
R. Nozaki、Junko N. Kondo、C. Hirose 等 6 位作者2001-07-26The Journal of Physical Chemistry B
Vibrational study by Raman spectroscopy was made of the layered perovskite compounds of the formula M 2 La 2 Ti 3 O 10 (M = H, Li, Na, K, Rb), K 2 La 2 Ti 3 O 10 ·2H 2 O, and H 2 La 2 Ti 3 O 10 · n H 2 O. The spectral features above 400 cm -1 were similar in all of the unhydrated samples suggesting that the bands orig…
Advanced Battery Materials and TechnologiesLayered Double Hydroxides Synthesis and ApplicationsMicrowave Dielectric Ceramics Synthesis
Satyanarayan Pal、Samudranil Pal2001-07-26Inorganic Chemistry
A dinuclear Ru(III) complex, [Ru2Cl2(PPh3)2(μ-Cl)2(μ-salhn)], has been synthesized and characterized by analytical, spectroscopic, magnetic, and X-ray diffractometry. The redox active complex displays two reductions corresponding to RuIII2/RuIIIRuII and RuIIIRuII/RuII2 couples. A weak antiferromagnetic spin coupling i…
Organometallic Complex Synthesis and CatalysisMetal complexes synthesis and propertiesMagnetism in coordination complexes
Keiichi Moriya、Toshiya Suzuki、Shinichi Yano 等 4 位作者2001-07-26The Journal of Physical Chemistry B
31 P and 13 C NMR studies are reported for a smectic A liquid crystal of haxakis[4-dodecyl(4-biphenoxy)]cyclotriphosphazene. In an intense magnetic field, the long axes of the biphenylene fragments and the alkyl chains align along the magnetic field, and the cyclotriphosphazene (ctp) ring-normal points preferentially…
Liquid Crystal Research AdvancementsSolid-state spectroscopy and crystallographyMolecular spectroscopy and chirality
Hisako Sato、Akihiko Yamagishi、Katsuyuki Kawamura2001-07-26The Journal of Physical Chemistry B
Molecular dynamics (MD) simulations have been performed to study the flexibility of smectite clay minerals. We aim at the quantitative understanding of the mechanical behavior of a single clay layer in a completely exfoliated state. The repeating unit of a clay layer is taken to be a o = 0.52 nm and b o = 0.902 nm wit…
Glass properties and applicationsSoil and Unsaturated FlowClay minerals and soil interactions
Roland Weidisch、SP Gido、David Uhrig 等 6 位作者2001-07-26Macromolecules
Tensile properties and morphology of tetrafunctional multigraft copolymers are investigated dependent on PS volume fraction and number of branch points. It is found that tetrafunctional multigraft copolymers with 22 vol % PS and seven branch points show a surprising high strain at break of about 2100%, about double th…
Advanced Polymer Synthesis and CharacterizationPolymer Surface Interaction StudiesBlock Copolymer Self-Assembly
Puspashree Mishra、K. P. Jain2001-07-26Physical review. B, Condensed matter
Confinement effects on first-order and second-order Raman scattering in nanocrystalline silicon are presented. The average dimension of the nanocrystals has been determined by an analysis of the first-order Raman spectra using the phenomenological phonon confinement model. The second-order acoustic bands 2LA and 2TA d…
Thin-Film Transistor TechnologiesSilicon Nanostructures and PhotoluminescenceNanowire Synthesis and Applications
Maria Clelia Righi、Sandro Scandolo、Stefano Serra 等 6 位作者2001-07-26Physical Review Letters
First-principles calculations are used to investigate the electronic properties of the surfaces of polyethylene. The calculations support the experimental evidence of a negative electron affinity, with calculated values of -0.17 eV and -0.10 eV for surfaces with chains perpendicular and parallel to the surface normal,…
Semiconductor materials and devicesHigh voltage insulation and dielectric phenomenaElectron and X-Ray Spectroscopy Techniques
Simonetta Iarlori、Davide Ceresoli、Marco Bernasconi 等 5 位作者2001-07-26The Journal of Physical Chemistry B
Dehydroxylation and silanization processes on the silica surface are studied by ab initio molecular dynamics. The (100) and (111) surfaces of β-cristobalite are used as two possible models of the hydroxylated amorphous surface. The activation energy and latent heat for the dehydroxylation reactions of the (100) surfac…
Glass properties and applicationsPhotonic Crystals and ApplicationsMesoporous Materials and Catalysis
Els H. A. de Hoog、Willem K. Kegel、Alfons van Blaaderen 等 4 位作者2001-07-26Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
The depletion-induced phase separation in a mixture of colloidal particles (PMMA-latex) and nonadsorbing polymers [poly(styrene)] in a solvent (mixture of tetralin, cis-decalin, and carbon tetrachloride) was investigated in real space with confocal scanning laser microscopy in the initial, intermediate, and final stag…
Material Dynamics and PropertiesSurfactants and Colloidal SystemsPickering emulsions and particle stabilization
Yu Han、Feng‐Shou Xiao、Shuo Wu 等 9 位作者2001-07-26The Journal of Physical Chemistry B
Heteroatoms of Al and Ti are effectively introduced into the framework of ordered mesoporous silica materials (designated as MAS-7 and MTS-9, respectively) in strong acidic media (pH < 0) by a two-step procedure. MAS-7 shows high catalytic activities for the cracking of both small (cumene) and bulky (1,3,5-tri-isoprop…
Zeolite Catalysis and SynthesisMesoporous Materials and CatalysisPolyoxometalates: Synthesis and Applications
Ibrahim Al-Lehyani、Mike Widom、Yang Wang 等 6 位作者2001-07-26Physical review. B, Condensed matter
The extension of the first-principles generalized pseudopotential theory (GPT) to transition-metal (TM) aluminides produces pair and many-body interactions that allow efficient calculations of total energies. In aluminum-rich systems treated at the pair-potential level, one practical limitation is a transition-metal o…
High-pressure geophysics and materialsQuasicrystal Structures and PropertiesX-ray Diffraction in Crystallography
Efim A. Brener、David A. Kessler2001-07-26arXiv
Comment on PRL v. 86, p. 5084 (2001) [cond-mat/0101016]. We point out that the authors' simulations are consistent with the known theory of steady-state solutions in this system.
Materials Science
R. Pfandzelter、M. Potthoff2001-07-26arXiv
The temperature-dependence of the magnetization near the surface of a band-ferromagnet is measured with monolayer resolution. The simultaneous application of novel highly surface-sensitive techniques enables one to deduce the layer-dependent magnetization curves at a Fe(100) surface. Analysis of data is based on a sim…
Materials ScienceStrongly Correlated Electrons
Corinna Schüler、Frank Caruso2001-07-26Biomacromolecules
Decomposable hollow capsules based on deoxyribonucleic acid (DNA) and a low molecular weight organic molecule, a naturally occurring polyamine, spermidine (SP), were formed by applying the layer-by-layer adsorption strategy to colloid particles, viz., assembling DNA/SP multilayers on colloids and subsequently removing…
Surface Modification and SuperhydrophobicityPolymer Surface Interaction StudiesDendrimers and Hyperbranched Polymers
S. Pekker、Jean‐Paul Salvetat、Emma Jakab 等 5 位作者2001-07-26The Journal of Physical Chemistry B
We have prepared hydrogenated single-wall and multiwall carbon nanotubes, as well as graphite, via a dissolved metal reduction method in liquid ammonia. The hydrogenated derivatives are thermally stable up to 400 °C. Above 400 °C, a characteristic decomposition takes place accompanied with the simultaneous formations…
Carbon Nanotubes in CompositesGraphene research and applicationsHydrogen Storage and Materials
S. D. M. Brown、Ado Jório、M. S. Dresselhaus 等 4 位作者2001-07-26Physical review. B, Condensed matter
We examine the behavior of the D-band feature in the Raman spectra of single-walled carbon nanotube (SWNT) bundles, observed between 1250 and $1450 {\mathrm{cm}}^{\ensuremath{-}1},$ as a function of the laser excitation energy. We used three SWNT samples with different diameters, and show that the D-band behavior of S…
Carbon Nanotubes in CompositesGraphene research and applicationsDiamond and Carbon-based Materials Research
Andrea C. Ferrari、John Robertson2001-07-26OpenAlex
The Raman spectra of a wide range of disordered and amorphous carbons have been measured under excitation from 785 to 229 nm. The dispersion of peak positions and intensities with excitation wavelength is used to understand the nature of resonant Raman scattering in carbon and how to derive the local bonding and disor…
Carbon Nanotubes in CompositesHigh-pressure geophysics and materialsDiamond and Carbon-based Materials Research
Kirsten Arnvig McGuire、Mads Siggaard-Andersen、Mamata Bangera 等 5 位作者2001-07-25Biochemistry
beta-Ketoacyl-[acyl carrier protein (ACP)] synthase forms new carbon-carbon bonds in three steps: transfer of an acyl primer from ACP to the enzyme, decarboxylation of the elongating substrate and its condensation with the acyl primer substrate. Six residues of Escherichia coli beta-ketoacyl-ACP synthase I (KAS I) imp…
Microbial bioremediation and biosurfactantsMicrobial Metabolic Engineering and BioproductionEnzyme Structure and Function